Diastasis recti - HELP!!!

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I am 22wks and have been diagnosed with this. This is my first pregnancy, single baby, and I'm not overweight. I am currently in physical therapy, but not doing heavy cardio nor am I doing anything on my back. Has anyone else experienced this? It's not really painful or wide at this point because we caught it early on, but looking for ways to keep it under control. Thanks in advance!